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There’s also $9 off the warehouse price of Pedigree Beef for Adult Dogs, with a scanning price of $24.99.

With the essentials covered, Costco is selling a curation of “wow” items, including a bottle of Penfold’s Grange 2012 vintage with a St Louis crystal decanter.

There's a slew of deals on everyday essentials. (Costco) ()

For those with finer tastes, a 5.34 carat, emerald-cut diamond wedding ring is available, along with a tin of caviar that comes with a mother-of-pearl spoon.

And if there is any spare room in your oversized trolley, there’s also a 10kg block of Cadbury chocolate available.

Costco makes the majority of its income by selling annual memberships, as its mark-up for products is only about 10 percent.

Morgan Stanley analyst Tom Kierath expects the bargain behemoth’s total sales to rise from $1.52 billion in 2016 to more than $4 billion, or about 1.8 percent, of the Australian food and grocery market by 2020 as the number of stores reaches 16.

According to Morgan Stanley, Costco's gross margins are about 14 percent, compared with 24 percent at Woolworths and 38 percent at Myer, and cost to sales is about 13 percent, less than half that of rivals.

The Marsden Park warehouse takes Costco's capital investment in Australia to more than $400 million and is the first store to be funded by the local business, rather than the parent company.

"We have plans for another five or six stores over the next three to four years," Costco Australia managing director Patrick Noone told the Australian Financial Review yesterday.

"We don't want to build too many too fast - everyone else has done that. We just want to build properties and see how they go."

The company also plans to launch an online store in a bid to extend customer reach, and remain competitive as retailing giant Amazon prepares to enter the market.

Mr Noone said he aimed to have the e-commerce offering live after the opening of a Costco distribution centre in Sydney’s West.

"That will be up and running in early 2019 and will have space in there to explore that dotcom business," he said.

Offers on products at Costco's New South Wales locations are valid until September 10.